Abstract: A brake caliper piston actuation device comprises a caliper housing (20) including a bore (22) extending through the caliper housing (20). An end cap closes the bore (22) and has an end cap extension (28) and a fluid port (32). A piston (40) is disposed in the bore (22). An actuation member (48) has an inner surface and an outer surface and is disposed in the bore (22) and extends axially over the piston (40) to slidably support and guide the piston (40). The inner surface of the actuation member (48) and the fluid end of the piston (40) and the end cap extension (28) define a fluid chamber (54) for containing a hydraulic fluid entering from the fluid port (32). A parking brake mechanism engages the actuation member (48) for causing axial movement of the actuation member (48). The piston (40) moves in response to the hydraulic fluid entering the fluid chamber (54) and by the parking brake mechanism advancing the actuation member (48) and pushing the piston (40) axially.

Abstract: A brake caliper piston actuation device comprises a caliper housing (20) including a bore (22) extending through the caliper housing (20). An end cap closes the bore (22) and has an end cap extension (28) and a fluid port (32). A piston (40) is disposed in the bore (22). An actuation member (48) has an inner surface and an outer surface and is disposed in the bore (22) and extends axially over the piston (40) to slidably support and guide the piston (40). The inner surface of the actuation member (48) and the fluid end of the piston (40) and the end cap extension (28) define a fluid chamber (54) for containing a hydraulic fluid entering from the fluid port (32). A parking brake mechanism engages the actuation member (48) for causing axial movement of the actuation member (48). The piston (40) moves in response to the hydraulic fluid entering the fluid chamber (54) and by the parking brake mechanism advancing the actuation member (48) and pushing the piston (40) axially.